problem with ChoiceRenderer

[Michael Jaruska]

Hi folks,

after hours of elaborating, searching docu and trying I'm totaly lost. My 
ChoiceRenderer is not
working.

Here is my code (not relevant code has been removed):

markup:
<select id="1" wicket:id="zoznam"></select>

page implementation:
public class PageEshop extends PageBase{
    public PageEshop(){
        ChoiceRendererVyrobok renderer = new ChoiceRendererVyrobok();
        List<Vyrobok> vyrobky = Arrays.asList(new Vyrobok("start", "-Vyberte typ-"), new Vyrobok("polstar", 
"Polštář"), new Vyrobok("deka", "Deka"));
        Vyrobok defaultChoice = vyrobky.get(0);
        DropDownChoice<Vyrobok> vyberVyrobku = new DropDownChoice<Vyrobok>("zoznam", new 
PropertyModel<Vyrobok>(defaultChoice, "kluc"), vyrobky, renderer);
        Form<Object> form = new Form<Object>("inputForm");
        form.add(vyberVyrobku);
        this.add(form);
    }
}

pojo:
public class Vyrobok implements Serializable{
    private String kluc;
    private String hodnota;

    public Vyrobok(String kluc, String hodnota){
        this.kluc = kluc;
        this.hodnota = hodnota;
    }
    //getters and setters for attributes
}

IChoiceRenderer implementation:
public class ChoiceRendererVyrobok implements IChoiceRenderer<Vyrobok>{
    @Override
    public Object getDisplayValue(Vyrobok vyrobok){
        return vyrobok.getHodnota();
    }

    @Override
    public String getIdValue(Vyrobok vyrobok, int index){
        return vyrobok.getKluc();
    }
}

When page is loaded, this error happens (not complete stack, not relevant 
removed):
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to 
cz.polstareadeky.utils.Vyrobok
        at 
cz.polstareadeky.ChoiceRendererVyrobok.getIdValue(ChoiceRendererVyrobok.java:1)
        at 
org.apache.wicket.markup.html.form.AbstractSingleSelectChoice.getModelValue(AbstractSingleSelectChoice.java:194)
        at 
org.apache.wicket.markup.html.form.FormComponent.getValue(FormComponent.java:837)

Something is wrong in ChoiceRendererVyrobok but I can't find what..

Any help is apreciated,

thanks, Michal

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